Running rough at startup after sitting for a while

I now have a little commuter car that I use during the week to save some gas. I only use my '03, F150 S-Crew 5.4L on the weekends. The first time I start the engine it runs really rough for a couple of minutes. It feels like it wants to jerk forward when I apply lightly on the brakes. I was told that the timing chain tensioner is oil loaded and that if you let the truck sit it will lose its charge. Could this be what's happening? Once a couple of minutes have transpired the engine runs like it was brand new and never runs rough again. Any comments? Thanks,
TonyC

first never heard of chain charge once the engine stops te chain will stay where it is unless someone moves the vehicle back or forward with out starting the vehicle. almost sounds like you are loosing your fuel pressure (backing back into the fuel tank) then once it runs a min it gets back to full pressure and is ok. Just my two cents. If that is the problem I would not worry about it. My runs alittle ruogh as well, I am like you I only use my 2000 on weekends.

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